anything you can get yours hands on tbh, if your single figures then the old balls yu use in the round especially for short game and 100 yrds in etc.
Range balls are nasty low compression rubbish you get zero idea of distance control etc.
Is this to play with or just practice?
If just practice, then I would say a box of cheap lake balls will do as you will not be so worried about losing them or someone else picking them up by mistake.
If to play with I think you need to try as many different balls as you can and see which you get on best with.